| 摘要 |
PURPOSE:To eliminate the possibilities of an erroneous insertion and an erroneous operation by giving a signal corresponding to a position provided on a containing rack to one input of the comparator circuit of an interface panel and a selection signal to the other input of all comparator circuits of the interface panel through a common route. CONSTITUTION:The comparator circuit C compares identification numbers f1-fn with a selection number (g), and outputs control signals i1-in when they are coincident with each other. Based on instructions of the control signals i1-in from the comparator circuit C, an I/O control circuit D executes I/O actions of I/O signal strings h1-hn. When the interface panel Bm is inserted into an arbitrary position on the containing rack, the identification number fm is given from an identification number package generator circuit F. On the other hand, the selection number (g) is given from a bus line G, and the comparator circuit C in the interface panel Bm compares the identification number fm with the selection signal (g) and the state of the control signal im is decided according as they are coincident with each other or not. Thus a simple circuit constitution can be realized, and the possibility of the erroneous insertion and action can be prevented because the same interface panel can be inserted at any position on the containing rack.
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